[libvirt-users] host freeze when starting VM

[Han Han]

It seems a kernel bug as your description. And I found some kvm problems fixed in 4.4.4:
* Tue Nov 10 2015 Laura Abbott <labbott at redhat.com> - 4.4.0-0.rc0.git6.1 - Linux v4.3-9393-gbd4f203 * Tue Nov 10 2015 Josh Boyer <jwboyer at fedoraproject.org> - Fix Yoga 900 rfkill switch issues (rhbz 1275490) - Fix incorrect size calculations in megaraid with 64K pages (rhbz 1269300) - CVE-2015-8104 kvm: DoS infinite loop in microcode DB exception (rhbz 1278496 1279691) - CVE-2015-5307 kvm: DoS infinite loop in microcode AC exception (rhbz 1277172 1279688)


----- Original Message -----
From: "Alexander Petrenz" <petrenz.a at gmail.com>
To: "Han Han" <hhan at redhat.com>
Cc: libvirt-users at redhat.com
Sent: Thursday, May 12, 2016 5:22:11 AM
Subject: Re: [libvirt-users] host freeze when starting VM

Hi Han,

thanks for your reply. I'm using KVM as hypervisor. The versions are:
Kernel: 4.5.2
Libvirt: 1.3.4-1

But its quite embarrasing... when I was answering your mail I was having a
look if there is a new kernel I can build, since I have to rely on some
patches. I upgraded from 4.4.3 to 4.5.2 and now libvirt doesn´t have any
problem.

So thanks for the heads up!

Regards
Alex


On Tue, May 10, 2016 at 11:18 AM, Han Han <hhan at redhat.com> wrote:

> Could you tell me you libvirt and kernel version? What is your hypervisor?
> Kvm or xen? And hypervisor's version?
>
> ----- Original Message -----
> From: "Alexander Petrenz" <petrenz.a at gmail.com>
> To: libvirt-users at redhat.com
> Sent: Saturday, May 7, 2016 5:37:41 AM
> Subject: [libvirt-users] host freeze when starting VM
>
> Hi together,
>
> when I´m starting a VM my host freezes gradually. This seems to happen
> because its running out of memory and no other process is able to do
> anything.
> I have 16GB of ram in total. 8GB are reserved for hugepages. So for the
> daily business on the host I have 8GB left. I don´t run many or
> extraordinary consuming software on the host - normally just a gnome
> session and the chromium browser. Right now htop tells me that 10.1 of 15.4
> GB are occupied, so that should be about 2GB, because I suppose 8GB are
> just reserved for the hugepages. I don´t have any swap space.
>
> In my latest attempt I gave a newly created VM 64MB of ram and this also
> brought the system down to its knees. So I would like to understand why
> this is happening. Is it some configuration issue I'm not aware of or maybe
> even some bug? Can someone give any idea on this?
>
> Thanks in advance
> Alex
>
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